Capturar THIS simulando pai e filho

by Rapha Souza

HTML

<script src="//code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<link rel="stylesheet" href="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>attributeStartsWith demo</title>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
 <label>Campo 1</label>
<input id="campo___1" onblur="captureChild(this)">
<br>
<label>Campo 2</label>
<input id="campo___2" onblur="captureChild(this)" >
<br>
<label>Campo 3</label>
<input id="campo___3" onblur="captureChild(this)">



						
					
					
							<div class="panel-body">
							<div class="form-group row">
              <div class="col-md-3 input-default">
              <label>Checkbox</label>
              <div class="checkbox">	
              <label >		
              <input id="option___1" value="opção" type="checkbox" onclick="captureChild(this)">	
              <span>Opção</span></label>
              </div><div class="checkbox">		
              <label>			<input id="option___2" value="opção2" type="checkbox" onclick="captureChild(this)">			<span>Opção</span>		</label>
             </div>
             <div class="checkbox">	
             <label >	
             <input id="option___3" value="opção3" type="checkbox" onclick="captureChild(this)"><span>Opção</span>		</label>
             </div>
             </div>
             </div>
             </div>
						
					

 <p id="demo">
 
 </p>
 
 
 
 <br>
<label>idcampo 1</label>
<input class="form-control"  id="idcampo___1" >
<br>
<label>idcampo 2</label>
<input class="form-control"  id="idcampo___2">
<label>idcampo 3</label>
<input class="form-control" ...

CSS

.row {
  background: #f8f9fa;
  margin-top: 20px;
}

.col {
  border: solid 1px #6c757d;
  padding: 10px;
}